Technical Guide · March 20, 2026
5 Reasons Why Zamak Outperforms Aluminium in Precision Die Casting
Expert insights from 30+ years of zinc die casting experience at Micrometal.
When it comes to precision die cast components, engineers and procurement managers often face the same question: should we go with aluminium or zamak? At Micrometal, we have been working with both materials for over 30 years.
Based on our experience producing millions of zinc die cast parts, here are five key reasons why zamak is often the smarter choice for precision technical components.
1. Superior Dimensional Tolerances
Zamak die casting achieves tolerances as tight as ±0.05 mm directly from the mould, with no secondary machining required. Aluminium die casting typically delivers tolerances of ±0.1 to 0.2 mm and almost always requires CNC finishing to meet tight specifications.
For applications where precision is critical — such as lock mechanisms, electronic housings, or gas valve bodies — this difference translates directly into lower production costs and faster delivery times.
2. Dramatically Longer Mould Life
| Material | Mould Lifespan | Cost Impact |
|---|---|---|
| Zamak | 750,000 – 2,000,000 shots | Lower cost per part |
| Aluminium | 100,000 – 250,000 shots | Higher tooling costs |
One of the most significant advantages of zamak over aluminium is the lifespan of the die casting moulds. This means your tooling investment is amortised over a much larger production run, resulting in a significantly lower cost per part. At Micrometal, we guarantee our moulds for 400,000 shots and store them in three vertical storage systems with a combined capacity of 185,000 kg.
3. 30% Energy Savings
Zamak melts at approximately 400°C, while aluminium requires temperatures of around 660°C. This 260°C difference means that zamak die casting consumes roughly 30% less energy than aluminium processing.
In an era where energy costs are rising and sustainability matters more than ever, this is a competitive advantage that directly impacts your production costs and environmental footprint. Zamak is also 100% recyclable with zero toxic emissions during the casting process.
4. Better Surface Finish and Plating
Zamak produces parts with an exceptionally smooth surface finish straight from the mould. All galvanic treatments — chrome plating, nickel plating, zinc plating, gold plating — adhere perfectly to zamak without requiring any pre-treatment.
Aluminium, on the other hand, needs extensive surface preparation before any plating can be applied, adding cost and time to the production process. For components that require a high-quality decorative or protective finish, zamak is the clear winner.
5. Complex Shapes in a Single Step
Thanks to its high fluidity and low melting point, zamak allows the casting of extremely complex geometries with thin walls, undercuts, threads, and holes — all in a single step. No machining, no welding, no assembly of multiple parts.
With aluminium die casting, achieving the same level of geometric complexity typically requires additional machining operations, which increases both cost and lead time.
When Should You Choose Aluminium Instead?
The Bottom Line
Best Applications for Zamak
Precision components in locks, electronics, gas valves, automotive interiors, furniture hardware, lighting, and appliances
Micrometal Expertise
Specialising in zamak hot chamber die casting and micro die casting since 1991, with 11 machines and 75,000 kg monthly capacity
For precision components in locks, electronics, gas valves, automotive interiors, furniture hardware, lighting, and appliances, zamak die casting offers better tolerances, longer mould life, lower energy costs, superior surface finishing, and more complex geometries than aluminium — all at a lower cost per part.
At Micrometal, we specialise in zamak hot chamber die casting and micro die casting since 1991. With 11 machines running two shifts and a monthly capacity of 75,000 kg, we are ready to support your next project.
Ready to Explore Zamak for Your Components?
Get expert guidance on whether zamak is the right material choice for your precision die casting project.
… | +39 030 7760830 | www.micrometal.it
The 7 Advantages of Zamak Die Casting: Decision Summary
Beyond the punctual comparison with aluminium, here is a summary of the 7 structural advantages that make zamak (EN 12844) the first-choice alloy for precision components 0.5 g – 1.5 kg in high volumes:
| # | Advantage | Key number | Comparison |
|---|---|---|---|
| 1 | Raw material and processing costs | -65% vs brass | real case 80g lock |
| 2 | Mechanical strength | 374 MPa (ZP2) | mild steel 250-400 MPa |
| 3 | Excellent surface finish | Ra 0.8-1.6 µm “as cast” | aluminium 1.6-3.2 µm |
| 4 | Production speed | 8-12 sec/part cycle | aluminium 30-60 sec |
| 5 | Long-life tooling | up to 2,000,000 shots | aluminium max 500,000 |
| 6 | Sustainability and recyclability | 95-100% recyclable | 5% energy for recycling |
| 7 | Geometric versatility | walls 0.3-0.5 mm minimum | threads direct-from-mould |
These 7 combined factors make zamak the dominant choice across 8 industrial sectors served by Micrometal: locks & security, automotive, gas valves, electronics, furniture & lighting, instrumentation, taps & fittings and fashion & leather goods.
When NOT to Choose Zamak
For technical honesty: zamak is excellent but not universal. Not recommended for:
- Components > 1.5 kg (tooling too expensive, better alternatives)
- Continuous-temperature applications > 100 °C (significant creep on ZP3/ZP5; ZP8 extends to 120°C but no further)
- Load-bearing structures with high-cycle fatigue (prefer structural aluminium or steel)
- High-salinity marine environments without surface protection
- Direct food contact without barrier (prefer AISI 316 stainless steel)
Specific Micrometal Advantages (beyond the 7)
- 400,000 shots warranty per customer mould, with case-by-case evaluation beyond this number
- 11 machines (7 standalone presses Agrati/Italpresse/Frech + 4 robotic Frech DAW 80 cells with Kawasaki/ABB), clamping force 20-90 t
- 75,000 kg/month production capacity
- Tolerances down to ±0.05 mm directly from mould
- Free co-design / DFM review before tool cutting
- ISO 9001:2015, RoHS materials, REACH-compliant supply chain
- 263 kWp on-site PV in Erbusco (BS), Italy — positive energy balance
📩 Got a zamak project? Send STEP/IGES and annual volume via contact page — first DFM feasibility note within 24h. See also Micrometal company and our machinery.